Broken case - Should I contact seller?

My lovely Caseology wavelength case, which I've used for about 6 weeks, has now got a small broken piece around the earphone socket cut out. The TPU lip is still intact but obviously that area isn't as strong anymore. That little piece has completely come away now. I'm not sure if I should bother to contact the seller, or Caseology, or not do anything. Any suggestions? It's a tough case to install and remove and I don't feel I've done anything heavy handed, ,and certainly not dropped the phone. I've read one or two reviews where people have had a similar issue.

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BUY Oneplus 2 from trusted eBay Seller - $435 - Works Tmobile LTE

After seeing it one oppomart for 459, i found 3 listings on ebay for 5 that ship from china. i just ordered mine. I also chatted with tmobile, and they said the phone will support tmobile lte and hspa+ bands.

http://www.ebay.com/itm/OnePlus-2-Sm...item3f518b9bc6

http://www.ebay.com/itm/OnePlus-2-Sm...item3d002a786f

http://www.ebay.com/itm/OnePlus-2-Sm...item2ee48b1f1c

excited to get it - expected august 25!!!